Personally I like to wait until the leaves start to fall, as it opens up the woods and I can see better. But you don't have to do that. Marc Anthony killed himself a HUGE buck stillhunting a couple of weeks and it was posted here.
As far as what time of day, it's just like if you were treestand hunting. You want to be out there when the deer are moving. If they are moving, then you have a much better chance of seeing them first, which is the whole idea.
If the ground conditions are damp, that's good also, as it makes it easier for you to walk quieter. I also really like windy days...REAL windy days...the kind that treestand hunters stay home for. The deer don't like being in the wind either, so they will concentrate in wind protected areas, and that makes it a lot easier for you to find deer. The HUNTING of those deer is still difficult...as you may now have too many eyes and ears to contend with, but at least you're into deer.
I also love to hunt this way during the rut, as deer are on the move, and you may encounter a buck just about anytime. If you see a single doe acting "hot"...tail twitching, looking backwards frequently...you can get close to where she was and wait for the buck that will follow. It gives you a LOT more freedom.
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